<template>
  <div class="login-container">
    <el-form ref="loginForm" :model="loginForm" :rules="loginRules" class="login-form" auto-complete="on" label-position="left">

      <div class="title-container">
        <h3 class="title"></h3>
      </div>

      <el-form-item prop="username">
        <span class="svg-container">
          <svg-icon icon-class="user" />
        </span>
        <el-input
          ref="username"
          v-model="loginForm.username"
          placeholder="请输入账号"
          name="username"
          type="text"
          tabindex="1"
          auto-complete="off"
        />
      </el-form-item>

      <el-form-item prop="password">
        <span class="svg-container">
          <svg-icon icon-class="password" />
        </span>
        <el-input
          :key="passwordType"
          ref="password"
          v-model="loginForm.password"
          :type="passwordType"
          placeholder="请输入密码"
          name="password"
          tabindex="2"
          auto-complete="on"
          @keyup.enter.native="handleLogin"
        />
        <span class="show-pwd" @click="showPwd">
          <svg-icon :icon-class="passwordType === 'password' ? 'eye' : 'eye-open'" />
        </span>
      </el-form-item>

      <el-row v-if="captchaVisible" :gutter="20">
        <el-col :md="16">
          <el-form-item prop="captcha">
            <span class="svg-container">
              <svg-icon icon-class="password" />
            </span>
            <el-input
              ref="captcha"
              v-model="loginForm.captcha"
              placeholder="请输入验证码"
              name="captcha"
              type="text"
              tabindex="1"
              auto-complete="off"
            />
          </el-form-item>
        </el-col>
        <el-col :md="8">
          <div class="captcha">{{ captchaLoading }}<img v-show="captchaShow" :src="captchaImg" @click="getCaptcha"></div>
        </el-col>
      </el-row>

      <el-row>
        <el-checkbox v-model="loginForm.remember" class="remember">记住密码</el-checkbox>
        <el-input v-show="false" ref="captchakey" v-model="loginForm.captchakey" type="hidden" name="captchakey" />
        <el-button :loading="loading" type="primary" class="login" @click.native.prevent="handleLogin">登录</el-button>
      </el-row>

    </el-form>
  </div>
</template>

<script>

import { captcha } from '@/api/user'
import Cookies from 'js-cookie'

export default {
  name: 'Login',
  data() {
    const validateUsername = (rule, value, callback) => {
      if (value === '') {
        callback(new Error('请输入正确的用户名！！'))
      } else {
        callback()
      }
    }
    const validatePassword = (rule, value, callback) => {
      if (value.length < 6) {
        callback(new Error('密码不能少于6个字符！！'))
      } else {
        callback()
      }
    }
    const validateCaptcha = (rule, value, callback) => {
      if (value.length < 1) {
        callback(new Error('请填写验证码！！'))
      } else {
        callback()
      }
    }
    return {
      loginForm: {
        username: '',
        password: '',
        remember: false,
        captchakey: '',
        captcha: ''
      },
      loginRules: {
        username: [{ required: true, trigger: 'blur', validator: validateUsername }],
        password: [{ required: true, trigger: 'blur', validator: validatePassword }],
        captcha: [{ required: true, trigger: 'blur', validator: validateCaptcha }]
      },
      loading: false,
      captchaVisible: true,
      captchaLoading: '',
      captchaShow: false,
      captchaImg: '',
      clientId: '',
      passwordType: 'password',
      redirect: undefined
    }
  },
  watch: {
    $route: {
      handler: function(route) {
        this.redirect = route.query && route.query.redirect
      },
      immediate: true
    }
  },
  created() {
    this.getLocalUser()
    this.getCaptcha()
    var _self = this
    document.onkeydown = function(e) {
      if (window.event === undefined) {
        var key = e.keyCode
      } else {
        key = window.event.keyCode
      }
      if (key === 13) {
        _self.handleLogin()
      }
    }
  },
  methods: {
    showPwd() {
      if (this.passwordType === 'password') {
        this.passwordType = ''
      } else {
        this.passwordType = 'password'
      }
      this.$nextTick(() => {
        this.$refs.password.focus()
      })
    },
    handleLogin() {
      console.log('handleLogin')
      this.$refs.loginForm.validate(valid => {
        if (valid) {
          console.log('valid')
          this.loading = true
          this.$store.dispatch('user/login', this.loginForm).then(() => {
            console.log('dispatch')
            this.rememberHandle()
            this.$router.push({ path: this.redirect || '/' })
            this.loading = false
          }).catch(() => {
            this.loading = false
          })
        } else {
          console.log('error submit!!')
          return false
        }
      })
    },
    getCaptcha() {
      this.captchaLoading = '获取中...'
      captcha().then(response => {
        if (response.status && response.data.length <= 0) {
          this.captchaVisible = false
          return
        }
        this.captchaImg = response.data.img
        this.loginForm.captchakey = response.data.key
        this.captchaLoading = ''
        this.captchaShow = true
      })
    },
    rememberHandle() {
      if (this.loginForm.remember) {
        const seconds = 12 * 60 * 60 // 保存12小时 (单位：秒)
        const expires = new Date(new Date() * 1 + seconds * 1000)
        Cookies.set('localUser', this.loginForm.username, { expires: expires })
        Cookies.set('localPwd', this.loginForm.password, { expires: expires })
      } else {
        Cookies.remove('localUser')
        Cookies.remove('localPwd')
      }
    },
    // 获取本地用户信息并自动进入
    getLocalUser() {
      const localUser = Cookies.get('localUser')
      const localPwd = Cookies.get('localPwd')
      if (localUser && localPwd) {
        this.loginForm.username = localUser
        this.loginForm.password = localPwd
        this.loginForm.remember = true
        // 自动进入后台
        this.loading = true
        this.$store.dispatch('user/login', this.loginForm).then(() => {
          this.$router.push({ path: this.redirect || '/' })
          this.loading = false
        }).catch(() => {
          this.loading = false
        })
      }
      // console.log('sessionStorage:' + localUser + ' = ' + localPwd)
    }

  }
}
</script>

<style lang="scss">
/* 修复input 背景不协调 和光标变色 */
/* Detail see https://github.com/PanJiaChen/vue-element-admin/pull/927 */

$bg:#283443;
$light_gray:#fff;
$cursor: #fff;

@supports (-webkit-mask: none) and (not (cater-color: $cursor)) {
  .login-container .el-input input {
    color: $cursor;
  }
}

/* reset element-ui css */
.login-container {
  .el-input {
    display: inline-block;
    height: 47px;
    width: 83%;

    input {
      background: transparent;
      border: 0px;
      -webkit-appearance: none;
      border-radius: 0px;
      padding: 12px 5px 12px 15px;
      color: $light_gray;
      height: 47px;
      caret-color: $cursor;

      &:-webkit-autofill {
        box-shadow: 0 0 0px 1000px $bg inset !important;
        -webkit-text-fill-color: $cursor !important;
      }
    }
  }

  .el-form-item {
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(0, 0, 0, 0.1);
    border-radius: 5px;
    color: #454545;
  }

}
</style>

<style lang="scss" scoped>
$bg:#2d3a4b;
$dark_gray:#889aa4;
$light_gray:#eee;

.login-container {
  min-height: 100%;
  width: 100%;
  background-color: $bg;
  overflow: hidden;
  background-image: url('/static/img/bg.110420cf.png');

  .login-form {
    position: relative;
    width: 520px;
    max-width: 100%;
    padding: 160px 35px 0;
    margin: 0 auto;
    overflow: hidden;
  }

  .tips {
    font-size: 14px;
    color: #fff;
    margin-bottom: 10px;

    span {
      &:first-of-type {
        margin-right: 16px;
      }
    }
  }

  .svg-container {
    padding: 6px 5px 6px 15px;
    color: $dark_gray;
    vertical-align: middle;
    width: 30px;
    display: inline-block;
  }

  .title-container {
    position: relative;

    .title {
      font-size: 26px;
      color: $light_gray;
      margin: 0px auto 40px auto;
      text-align: center;
      font-weight: bold;
    }
  }

  .show-pwd {
    position: absolute;
    right: 10px;
    top: 7px;
    font-size: 16px;
    color: $dark_gray;
    cursor: pointer;
    user-select: none;
  }
  .captcha {
    height: 55px;
    line-height: 55px;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 5px;
    overflow: hidden;
    color: #fff;
    img {
      width: 100%;
      height: 100%;
    }
  }
  .remember {
    color: #fff;
  }
  .login {
    width: 100%;
    margin-top: 15px;
  }

}
</style>
